bug with dh-make-golang estimate: src/ folder does not exists

[pymnh]

When running dh-make-golang estimate github.com/caddyserver/caddy, it will fail shortly with the following error:

2021/03/19 11:43:14 lstat /tmp/dh-make-golang225762394/src: no such file or directory

The problem as it seems to me is that go get does not download the source files to src/, but instead everything lands in pkg/mod. I understand the change in the download directory was introduced in v1.12 and is default as of v1.13, see here: golang/go#31529

I can reproduce the error with GO111MODULE set to off, on and auto. I am using ubuntu 20.10 with go v. 1.14 and can reproduce the error with both dh-make-golang v0.3.3 and v0.4.0

On debian buster with go v. 1.11 dh-make-golang estimate github.com/caddyserver/caddy seems to run fine (but will eventually fail because of a missing core library that the package depends on but that was indroduced with go v1.13 😞).

[pymnh]

The error does not occur with these little changes applied:

diff --git a/estimate.go b/estimate.go
index 5d10cf5..7d5e782 100644
--- a/estimate.go
+++ b/estimate.go
@@ -19,7 +19,7 @@ import (
 func get(gopath, repo string) error {
 	done := make(chan struct{})
 	defer close(done)
-	go progressSize("go get", filepath.Join(gopath, "src"), done)
+	go progressSize("go get", filepath.Join(gopath, "pkg", "mod"), done)
 
 	// As per https://groups.google.com/forum/#!topic/golang-nuts/N5apfenE4m4,
 	// the arguments to “go get” are packages, not repositories. Hence, we
@@ -37,7 +37,7 @@ func get(gopath, repo string) error {
 }
 
 func removeVendor(gopath string) (found bool, _ error) {
-	err := filepath.Walk(filepath.Join(gopath, "src"), func(path string, info os.FileInfo, err error) error {
+	err := filepath.Walk(filepath.Join(gopath, "pkg", "mod"), func(path string, info os.FileInfo, err error) error {
 		if err != nil {
 			return err
 		}

However, instead it will fail only shortly after, with the following error.

2021/03/19 13:13:54 unlinkat /tmp/dh-make-golang889617655/pkg/mod/github.com/cpuguy83/go-md2man/v2@v2.0.0/vendor/modules.txt: permission denied

I am unsure if it is at all related, or an issue of its own.

The file permissions for /tmp/dh-make-golang889617655/pkg/mod/github.com/cpuguy83/go-md2man/v2@v2.0.0/vendor/modules.txt are set to 444/readonly, I understand this is usual: golang/go#27161

[creekorful]

When packaging Debian library it is common practice to be on Debian unstable (sid) and install dh-make-golang using APT, so you are sure to have the latest up-to-date dependencies installed. Maybe you can try again in a VM for example?

[pymnh]

I can reproduce the error on an up-to-date debian sid, with dh-make-golang installed from the repos.

[creekorful]

What's the output of go version on your debian/sid?

[pymnh]

% go version
go version go1.15.9 linux/amd64

[creekorful]

That's definitely strange. I'm running dh-make-golang v0.4.0 with go 1.15.9 and I haven't face the same issue as you. Can you maybe try to run estimate on another repository and see if it works?

creekorful@debuild:~$ dh-make-golang estimate github.com/creekorful/direktion
2021/03/19 20:53:20 Bringing github.com/creekorful/direktion to Debian requires packaging the following Go packages:
github.com/creekorful/direktion

for example.

[pymnh]

i picked two random ITPs from wnpp.debian.net, getting mixed results:

% dh-make-golang estimate github.com/mattbaird/elastigo
2021/03/19 21:15:56 Bringing github.com/mattbaird/elastigo to Debian requires packaging the following Go packages:
github.com/mattbaird/elastigo
    github.com/bitly/go-hostpool

% dh-make-golang estimate github.com/cli/cli 
go get: 0.00 KiBgo: downloading github.com/mgutz/ansi v0.0.0-20200706080929-d51e80ef957d
go: downloading github.com/mattn/go-isatty v0.0.12
go: downloading github.com/itchyny/gojq v0.12.1
go: downloading github.com/henvic/httpretty v0.0.6
go: downloading github.com/cli/safeexec v1.0.0
go: downloading gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
go: downloading github.com/cli/shurcooL-graphql v0.0.0-20200707151639-0f7232a2bf7e
go: downloading github.com/mitchellh/go-homedir v1.1.0
go: downloading golang.org/x/sync v0.0.0-20190423024810-112230192c58
go: downloading github.com/stretchr/testify v1.6.1
go: downloading github.com/AlecAivazis/survey/v2 v2.2.7
go: downloading golang.org/x/crypto v0.0.0-20201016220609-9e8e0b390897
go: downloading github.com/google/go-cmp v0.5.2
go: downloading github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
go: downloading github.com/shurcooL/githubv4 v0.0.0-20200928013246-d292edc3691b
go get: 0.00 KiBgo: downloading github.com/MakeNowJust/heredoc v1.0.0
go: downloading github.com/muesli/termenv v0.7.4
go: downloading github.com/mattn/go-colorable v0.1.8
go: downloading github.com/enescakir/emoji v1.0.0
go: downloading github.com/itchyny/timefmt-go v0.1.1
go: downloading golang.org/x/text v0.3.4
go get: 0.00 KiBgo: downloading github.com/itchyny/astgen-go v0.0.0-20210113000433-0da0671862a3
go: downloading github.com/cli/oauth v0.8.0
go: downloading github.com/davecgh/go-spew v1.1.1
go: downloading golang.org/x/net v0.0.0-20200707034311-ab3426394381
go: downloading golang.org/x/sys v0.0.0-20210113181707-4bcb84eeeb78
go: downloading github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
go: downloading github.com/spf13/cobra v1.1.1
go: downloading github.com/lucasb-eyer/go-colorful v1.0.3
go: downloading github.com/rivo/uniseg v0.1.0
go get: 0.00 KiBgo: downloading github.com/charmbracelet/glamour v0.2.1-0.20200724174618-1246d13c1684
go: downloading github.com/pmezard/go-difflib v1.0.0
go get: 0.00 KiBgo: downloading github.com/hashicorp/go-version v1.2.1
go: downloading github.com/spf13/pflag v1.0.5
go: downloading github.com/briandowns/spinner v1.11.1
go get: 0.00 KiBgo: downloading github.com/cli/browser v1.0.0
go get: 0.00 KiBgo: downloading github.com/inconshreveable/mousetrap v1.0.0
go: downloading github.com/mattn/go-runewidth v0.0.9
go get: 0.00 KiBgo: downloading github.com/cpuguy83/go-md2man/v2 v2.0.0
go: downloading github.com/yuin/goldmark v1.2.0
go get: 0.00 KiBgo: downloading github.com/fatih/color v1.7.0
go: downloading github.com/olekukonko/tablewriter v0.0.4
go: downloading github.com/muesli/reflow v0.1.0
go get: 0.00 KiBgo: downloading github.com/russross/blackfriday/v2 v2.0.1
go: downloading github.com/microcosm-cc/bluemonday v1.0.2
go: downloading github.com/alecthomas/chroma v0.7.3
go: downloading github.com/shurcooL/sanitized_anchor_name v1.0.0
go get: 0.00 KiBgo: downloading github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964
go: downloading github.com/dlclark/regexp2 v1.2.0
2021/03/19 21:17:44 lstat /tmp/dh-make-golang001898671/src: no such file or directory

[sab-regime]

**```

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